drivers/mfd/bd9571mwv.c

   1 /*
   2  * ROHM BD9571MWV-M MFD driver
   3  *
   4  * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether expressed or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.
  14  *
  15  * Based on the TPS65086 driver
  16  */
  17
  18 #include <linux/i2c.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/mfd/core.h>
  21 #include <linux/module.h>
  22
  23 #include <linux/mfd/bd9571mwv.h>
  24
  25 static const struct mfd_cell bd9571mwv_cells[] = {
  26         { .name = "bd9571mwv-regulator", },
  27         { .name = "bd9571mwv-gpio", },
  28 };
  29
  30 static const struct regmap_range bd9571mwv_readable_yes_ranges[] = {
  31         regmap_reg_range(BD9571MWV_VENDOR_CODE, BD9571MWV_PRODUCT_REVISION),
  32         regmap_reg_range(BD9571MWV_BKUP_MODE_CNT, BD9571MWV_BKUP_MODE_CNT),
  33         regmap_reg_range(BD9571MWV_AVS_SET_MONI, BD9571MWV_AVS_DVFS_VID(3)),
  34         regmap_reg_range(BD9571MWV_VD18_VID, BD9571MWV_VD33_VID),
  35         regmap_reg_range(BD9571MWV_DVFS_VINIT, BD9571MWV_DVFS_VINIT),
  36         regmap_reg_range(BD9571MWV_DVFS_SETVMAX, BD9571MWV_DVFS_MONIVDAC),
  37         regmap_reg_range(BD9571MWV_GPIO_IN, BD9571MWV_GPIO_IN),
  38         regmap_reg_range(BD9571MWV_GPIO_INT, BD9571MWV_GPIO_INTMASK),
  39         regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTMASK),
  40 };
  41
  42 static const struct regmap_access_table bd9571mwv_readable_table = {
  43         .yes_ranges     = bd9571mwv_readable_yes_ranges,
  44         .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_readable_yes_ranges),
  45 };
  46
  47 static const struct regmap_range bd9571mwv_writable_yes_ranges[] = {
  48         regmap_reg_range(BD9571MWV_BKUP_MODE_CNT, BD9571MWV_BKUP_MODE_CNT),
  49         regmap_reg_range(BD9571MWV_AVS_VD09_VID(0), BD9571MWV_AVS_VD09_VID(3)),
  50         regmap_reg_range(BD9571MWV_DVFS_SETVID, BD9571MWV_DVFS_SETVID),
  51         regmap_reg_range(BD9571MWV_GPIO_DIR, BD9571MWV_GPIO_OUT),
  52         regmap_reg_range(BD9571MWV_GPIO_INT_SET, BD9571MWV_GPIO_INTMASK),
  53         regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTMASK),
  54 };
  55
  56 static const struct regmap_access_table bd9571mwv_writable_table = {
  57         .yes_ranges     = bd9571mwv_writable_yes_ranges,
  58         .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_writable_yes_ranges),
  59 };
  60
  61 static const struct regmap_range bd9571mwv_volatile_yes_ranges[] = {
  62         regmap_reg_range(BD9571MWV_DVFS_MONIVDAC, BD9571MWV_DVFS_MONIVDAC),
  63         regmap_reg_range(BD9571MWV_GPIO_IN, BD9571MWV_GPIO_IN),
  64         regmap_reg_range(BD9571MWV_GPIO_INT, BD9571MWV_GPIO_INT),
  65         regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTREQ),
  66 };
  67
  68 static const struct regmap_access_table bd9571mwv_volatile_table = {
  69         .yes_ranges     = bd9571mwv_volatile_yes_ranges,
  70         .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_volatile_yes_ranges),
  71 };
  72
  73 static const struct regmap_config bd9571mwv_regmap_config = {
  74         .reg_bits       = 8,
  75         .val_bits       = 8,
  76         .cache_type     = REGCACHE_RBTREE,
  77         .rd_table       = &bd9571mwv_readable_table,
  78         .wr_table       = &bd9571mwv_writable_table,
  79         .volatile_table = &bd9571mwv_volatile_table,
  80         .max_register   = 0xff,
  81 };
  82
  83 static const struct regmap_irq bd9571mwv_irqs[] = {
  84         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD1, 0,
  85                        BD9571MWV_INT_INTREQ_MD1_INT),
  86         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD2_E1, 0,
  87                        BD9571MWV_INT_INTREQ_MD2_E1_INT),
  88         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD2_E2, 0,
  89                        BD9571MWV_INT_INTREQ_MD2_E2_INT),
  90         REGMAP_IRQ_REG(BD9571MWV_IRQ_PROT_ERR, 0,
  91                        BD9571MWV_INT_INTREQ_PROT_ERR_INT),
  92         REGMAP_IRQ_REG(BD9571MWV_IRQ_GP, 0,
  93                        BD9571MWV_INT_INTREQ_GP_INT),
  94         REGMAP_IRQ_REG(BD9571MWV_IRQ_128H_OF, 0,
  95                        BD9571MWV_INT_INTREQ_128H_OF_INT),
  96         REGMAP_IRQ_REG(BD9571MWV_IRQ_WDT_OF, 0,
  97                        BD9571MWV_INT_INTREQ_WDT_OF_INT),
  98         REGMAP_IRQ_REG(BD9571MWV_IRQ_BKUP_TRG, 0,
  99                        BD9571MWV_INT_INTREQ_BKUP_TRG_INT),
 100 };
 101
 102 static struct regmap_irq_chip bd9571mwv_irq_chip = {
 103         .name           = "bd9571mwv",
 104         .status_base    = BD9571MWV_INT_INTREQ,
 105         .mask_base      = BD9571MWV_INT_INTMASK,
 106         .ack_base       = BD9571MWV_INT_INTREQ,
 107         .init_ack_masked = true,
 108         .num_regs       = 1,
 109         .irqs           = bd9571mwv_irqs,
 110         .num_irqs       = ARRAY_SIZE(bd9571mwv_irqs),
 111 };
 112
 113 static int bd9571mwv_identify(struct bd9571mwv *bd)
 114 {
 115         struct device *dev = bd->dev;
 116         unsigned int value;
 117         int ret;
 118
 119         ret = regmap_read(bd->regmap, BD9571MWV_VENDOR_CODE, &value);
 120         if (ret) {
 121                 dev_err(dev, "Failed to read vendor code register (ret=%i)\n",
 122                         ret);
 123                 return ret;
 124         }
 125
 126         if (value != BD9571MWV_VENDOR_CODE_VAL) {
 127                 dev_err(dev, "Invalid vendor code ID %02x (expected %02x)\n",
 128                         value, BD9571MWV_VENDOR_CODE_VAL);
 129                 return -EINVAL;
 130         }
 131
 132         ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_CODE, &value);
 133         if (ret) {
 134                 dev_err(dev, "Failed to read product code register (ret=%i)\n",
 135                         ret);
 136                 return ret;
 137         }
 138
 139         if (value != BD9571MWV_PRODUCT_CODE_VAL) {
 140                 dev_err(dev, "Invalid product code ID %02x (expected %02x)\n",
 141                         value, BD9571MWV_PRODUCT_CODE_VAL);
 142                 return -EINVAL;
 143         }
 144
 145         ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_REVISION, &value);
 146         if (ret) {
 147                 dev_err(dev, "Failed to read revision register (ret=%i)\n",
 148                         ret);
 149                 return ret;
 150         }
 151
 152         dev_info(dev, "Device: BD9571MWV rev. %d\n", value & 0xff);
 153
 154         return 0;
 155 }
 156
 157 static int bd9571mwv_probe(struct i2c_client *client,
 158                           const struct i2c_device_id *ids)
 159 {
 160         struct bd9571mwv *bd;
 161         int ret;
 162
 163         bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
 164         if (!bd)
 165                 return -ENOMEM;
 166
 167         i2c_set_clientdata(client, bd);
 168         bd->dev = &client->dev;
 169         bd->irq = client->irq;
 170
 171         bd->regmap = devm_regmap_init_i2c(client, &bd9571mwv_regmap_config);
 172         if (IS_ERR(bd->regmap)) {
 173                 dev_err(bd->dev, "Failed to initialize register map\n");
 174                 return PTR_ERR(bd->regmap);
 175         }
 176
 177         ret = bd9571mwv_identify(bd);
 178         if (ret)
 179                 return ret;
 180
 181         ret = regmap_add_irq_chip(bd->regmap, bd->irq, IRQF_ONESHOT, 0,
 182                                   &bd9571mwv_irq_chip, &bd->irq_data);
 183         if (ret) {
 184                 dev_err(bd->dev, "Failed to register IRQ chip\n");
 185                 return ret;
 186         }
 187
 188         ret = mfd_add_devices(bd->dev, PLATFORM_DEVID_AUTO, bd9571mwv_cells,
 189                               ARRAY_SIZE(bd9571mwv_cells), NULL, 0,
 190                               regmap_irq_get_domain(bd->irq_data));
 191         if (ret) {
 192                 regmap_del_irq_chip(bd->irq, bd->irq_data);
 193                 return ret;
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int bd9571mwv_remove(struct i2c_client *client)
 200 {
 201         struct bd9571mwv *bd = i2c_get_clientdata(client);
 202
 203         regmap_del_irq_chip(bd->irq, bd->irq_data);
 204
 205         return 0;
 206 }
 207
 208 static const struct of_device_id bd9571mwv_of_match_table[] = {
 209         { .compatible = "rohm,bd9571mwv", },
 210         { /* sentinel */ }
 211 };
 212 MODULE_DEVICE_TABLE(of, bd9571mwv_of_match_table);
 213
 214 static const struct i2c_device_id bd9571mwv_id_table[] = {
 215         { "bd9571mwv", 0 },
 216         { /* sentinel */ }
 217 };
 218 MODULE_DEVICE_TABLE(i2c, bd9571mwv_id_table);
 219
 220 static struct i2c_driver bd9571mwv_driver = {
 221         .driver         = {
 222                 .name   = "bd9571mwv",
 223                 .of_match_table = bd9571mwv_of_match_table,
 224         },
 225         .probe          = bd9571mwv_probe,
 226         .remove         = bd9571mwv_remove,
 227         .id_table       = bd9571mwv_id_table,
 228 };
 229 module_i2c_driver(bd9571mwv_driver);
 230
 231 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
 232 MODULE_DESCRIPTION("BD9571MWV PMIC Driver");
 233 MODULE_LICENSE("GPL v2");